An adjective is a word that tells about a noun. There are different types of adjectives.
Adjectives which show how many persons or things are meant or which show in what order a person or thing stands are Adjectives of Number. Adjectives of number answer the questions “In what order?” and “How many?”
The fourth boy is the monitor. (In what order?)
There are some men in the room. (How many?)
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.